Close the tempfile for PyPy+Windows.

Otherwise there's no guarantee it's closed by the time we try
to os.remove, and Windows doesn't like that very much.

Author: Julian

jsonschema/tests/test_cli.py

@@ -697,6 +697,7 @@ def test_successful_validation_of_just_the_schema_pretty_output(self):
 
     def test_successful_validation_via_explicit_base_uri(self):
         ref_schema_file = tempfile.NamedTemporaryFile(delete=False)
+        ref_schema_file.close()
         self.addCleanup(os.remove, ref_schema_file.name)
 
         ref_path = Path(ref_schema_file.name)
@@ -717,6 +718,7 @@ def test_successful_validation_via_explicit_base_uri(self):
 
     def test_unsuccessful_validation_via_explicit_base_uri(self):
         ref_schema_file = tempfile.NamedTemporaryFile(delete=False)
+        ref_schema_file.close()
         self.addCleanup(os.remove, ref_schema_file.name)
 
         ref_path = Path(ref_schema_file.name)